Deck 22: Basics of Electronics and Computer Systems

Question 1

The EEPROM located in a computer allows stored information to be electrically changed.

Answer 1

True

Question 2

A CAN [controller area network] bus is a low-speed data bus.

Answer 2

False

Question 3

Which of the following is NOT made of semiconductor material?

A) zener diode
B) LED
C) magnetic pulse [PM] generator
D) transistor

Answer 3

C

Question 4

Twisting together two wires that carry data from one computer module to another increases the possibility that radio waves and magnetic fields can interfere with data transmission.

Question 5

The instrument panel warning light is called a DTC.

Question 6

Actuators are electromechanical devices that convert mechanical action into electrical signals.

Question 7

A thermistor is a temperature-variable transistor.

Question 8

Which of the following is a semiconductor?

A) diode
B) transistor
C) integrated circuit
D) all answers are correct

Question 9

Multiplexing requires many more wires and additional sensors in the vehicle network.

Question 10

Some common semiconductor materials include silicon and germanium.

Question 11

The clock in a computer is needed to maintain the orderly flow of information throughout the computer's circuitry by transmitting one bit of binary code for each clock pulse.

Question 12

A scan tool is NOT required to retrieve DTCs on late model vehicles.

Question 13

Semiconductors are made of ______.

A) gallium
B) silicon
C) copper
D) none of these answers is correct

Question 14

A multiplex wiring system uses bus data links that connect different computers or control modules together.

Question 15

A Wheatstone bridge is used as a variable resistance sensor.

Question 16

Before an analog sensor signal can be processed by a computer, it must first be converted into a digital format.

Question 17

In an OBD-II system, each component is checked by a diagnostic routine to verify that it is functioning properly.

Question 18

When disconnecting and connecting electronic components, the ignition switch should be turned off.

Question 19

The different names for the legs of a transistor are the emitter, base, and collector.

Question 20

Reflashing a computer requires that the computer be removed from the vehicle and sent back to the manufacturer for reflashing.

Question 21

Which of the following is a type of diode?

A) LED
B) zener
C) clamping
D) all answers are correct

Question 22

The unit of capacitance is ______.

A) coulomb
B) farad
C) gauss
D) hertz

Question 23

Technician A says transistors are semiconductors. Technician B says transistors function as one-way valves for current flow. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 24

Technician A says when positive voltage is applied to the base of an NPN transistor, the transistor is turned on. Technician B says when an NPN transistor is turned on, current flows through the collector and emitter of the transistor. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 25

Energy storage is being discussed. Technician A says a battery stores energy chemically. Technician B says a capacitor stores energy in an electrostatic field between two electrodes. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 26

Technician A says some types of voltage sensors provide input to the computer by modifying or controlling a constant, predetermined voltage signal. Technician B says some types of voltage sensors provide a voltage generating signal. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 27

Technician A says diodes are used to rectify the voltage produced from an AC generator. Technician B says a zener diode protects circuit components from voltage spikes. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 28

The two types of semiconductor materials are P-type and ______.

A) B-type
B) K-type
C) N-type
D) Y-type

Question 29

Technician A says a Hall-effect switch uses a semiconductor, permanent magnet, and trigger wheel to measure shaft speed. Technician B says an engine coolant temperature sensor is basically a thermistor. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 30

An engine coolant temperature sensor is an example of a(n) ______.

A) potentiometer
B) actuator
C) thermistor
D) Wheatstone bridge

Question 31

Some multimeters display RMS readings for ______.

A) AC circuits
B) DC circuits
C) high resistance values
D) low resistance values

Question 32

Technician A says static electricity can generate more than 25,000 volts and can damage electronic components. Technician B says to avoid touching bare metal contacts because oils from the skin can cause corrosion and poor electrical contact. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 33

Which of the following is associated with voltage frequency?

A) cycle
B) hertz
C) both "cycle" and "hertz"
D) neither "cycle" nor "hertz"

Question 34

Technician A says the primary purpose of a multiplexing system is to send and receive multiple analog signals. Technician B says multiplexing uses bus data links. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 35

Technician A says N-type semiconductors have loose, or excess, electrons. Technician B says P-type semiconductors are positively charged materials. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 36

Which of the following is NOT a name for a transistor leg?

A) base
B) collector
C) emitter
D) transmitter

Question 37

Technician A says diodes are semiconductors. Technician B says diodes function as electronic circuit relays. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 38

If a 100 microfarad capacitor is charged off of a 12 volt battery, how many volts will be present between the terminals of the capacitor?

A) 0.0000012 volt
B) 0.00012 volt
C) .12 volt
D) 12 volts

Question 39

Which of the following is not a type voltage generating sensor?

A) coolant temperature sensor [CTS]
B) oxygen sensor
C) knock sensor
D) magnetic pulse [PM] generator

Question 40

Actuators (outputs) are being discussed. Technician A says they are variable resistance/ reference-types, switches, and thermistors. Technician B says they convert electrical current into mechanical action. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 41

A(n) _____is often used to prevent damage to electronic components from the voltage spikes produced when electromagnetic coils are turned off.

A) clamping diode
B) zener diode
C) NPN transistor
D) PNP transistor

Question 42

When a diode is _____ current cannot flow through it.

A) forward biased
B) reverse biased
C) excited
D) grounded

Question 43

Semiconductors are being discussed. Technician A says a semiconductor can be used as a conductor. Technician B says a semiconductor can be used as an insulator. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 44

The reference voltage [Vref] sent to most sensors ranges from _____ to _____ volts.

A) 0.5, 0.9
B) 1.5, 1.9
C) 5.0, 9.0
D) 10.0, 12.6

Question 45

Technician A says serial data passing through the vehicle's data bus can be monitored with a scan tool. Technician B says serial data travels through the vehicle on a twisted pair of wires-one wire is grounded to the chassis and the other wire is the serial bus transmission wire. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 46

The _____ changes analog signals produced by sensors into digital signals that the computer can use to process and store data.

A) rectifier
B) inverter
C) CPU [central processing unit]
D) A to D converter

Question 47

Pulse width is measured in _____.

A) hertz
B) percentage
C) milliseconds
D) millimeters

Question 48

_____ allows control modules to share sensor and output status information without the need for additional sensors or wiring.

A) Multiplexing
B) Transcription
C) Reprogramming
D) Pulse width modulation

Question 49

The number of charge/discharge cycles an ultracapacitor can supply to the hybrid traction motor system is approximately ______.

A) 100,000
B) 1 million
C) 20 million
D) infinite

Question 50

Starting in model year 2008, what type of communication protocol is required for diagnostics?

A) Class-A [UART]
B) Class-B [SAE J-1850]
C) Class-C [CAN]
D) Class-D [SAE J-1761]

Question 51

AND, NOT, OR, and NAND are types of ______.

A) multiplex networks
B) pressure sensors
C) logic gates
D) PROM chips

Question 52

Transistor operation is being discussed. Technician A says that when the base of a PNP is connected to ground, the transistor is turned on. Technician B says that when the base of an NPN transistor has a positive voltage applied to it, the transistor is turned on. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 53

Which of the following does NOT use a magnetic pulse generator [PM generator]?

A) wheel speed sensor
B) throttle position sensor
C) vehicle speed sensor
D) crankshaft position sensor

Question 54

The voltage applied to the _____ of a transistor controls the flow of electric current through the transistor.

A) base
B) emitter
C) collector
D) cathode

Question 55

The DLC connector on an OBDII vehicle is located ______.

A) under the hood, near the battery
B) under the dash on the driver's side
C) under the hood, on the firewall
D) under the hood in the fuse/relay center

Question 56

The four basic functions of a computer are input, output, processing, and _____.

A) reflashing
B) monitoring
C) attenuation
D) storage

Question 57

Computer memory is being discussed. Technician A says RAM-type memory is erased when the vehicle's battery is disconnected from the computer. Technician B says ROM memory can be erased with a scan tool. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 58

The throttle position sensor is a rotary _____.

A) pulse generator
B) hall-effect sensor
C) potentiometer
D) magnetometer

Question 59

OBDII technology is being discussed. Technician A says the OBDII system has the ability to store a freeze frame [snapshot] of the operating conditions that existed when the fault occurred. Technician B says vehicle identification must be transmitted automatically to the scan tool. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 60

Which of the following is NOT a type of actuator?

A) solenoid
B) relay
C) magnetic pulse generator
D) electric motor

Question 61

____________________ means that data concerning the effects of the computer's commands are fed back to the computer as an input signal.

Question 62

A(n) ____________________ is a special diode that emits light when current passes through it.

Question 63

The type of memory that contains specific information about the vehicle and can be removed and reprogrammed or replaced is called ____________________.

Question 64

A common use for a clamping diode is in the air-conditioning ____________________ coil.

Question 65

Technician A touches a good ground immediately before touching a computer module. Technician B wears a grounding wrist strap before touching the computer electrical connections and computer case. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 66

A(n) ____________________ is the simplest type of semiconductor.

Question 67

A(n) ____________________ module allows for data exchange between two different buses.

Question 68

Lab scopes are being discussed. Technician A says a lab scope can be used to measure resistance. Technician B says that a lab scope can be used to measure frequency by dividing the length of a cycle into 1. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 69

An electronic device that stores and processes data is a(n) ____________________.

Question 70

____________________ are sometimes called condensers.

Question 71

The location in the computer memory where a piece of data is stored is called a(n) ____________________.

Question 72

Variable capacitors are called ____________________.

Question 73

A(n) ____________________ is a material or device that can function as either a conductor or an insulator.

Question 74

Digital signals are typically called ____________________ patterns.

Question 75

The two main computers in a modern vehicle are the PCM [powertrain control module] and the _____________________.

Question 76

Zener diodes are often used to regulate circuit ____________________.

Question 77

A ____________________ is used to amplify and condition the weak voltage signals from some sensors, typically Hall-effect type sensors.

Question 78

On today's vehicles, ____________________ diodes are commonly used to prevent voltage spikes in circuits as magnetic fields collapse.

Question 79

Which of the following requires a high-speed bus?

A) antilock brakes
B) windshield wipers
C) power windows
D) horn

Question 80

An ____________________ signal is an infinitely variable voltage that can change within a given range.